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The blasting dynamic response of the gas pipeline and surrounding soil during the excavation of the cross passage at the entrance and exit C of Jinding Street Station of Beijing Metro Line 11 was analyzed using the finite software LS-DYNA. The numerical model's accuracy was confirmed by comparing it with blast-induced vibration data from on-site surveys. The study focused on the dynamic response of the buried gas pipeline to tunnel blasting, considering factors such as different cutting hole delay times, single hole charge, and soil properties. The results indicated that the peak particle velocity (PPV) from the numerical model was within 20% of the field test data. The PPV and peak effective stress (PES) of the pipeline were highest at the side back of the explosion source. A linear relationship between PPV values of the surface soil and the pipeline was observed when the horizontal distance from the tunnel center exceeded 3m in the axial direction of the gas pipeline. The PPVs and PESs on the cross-section of the gas pipeline did not change significantly with increasing delay times between cutting holes. Furthermore, increasing the charge of the cutting hole from 0.2 kg to 0.6 kg led to an increase of 0.5~2.5 times in PPVs and 0.5~1.5 times in PESs. The soil type around the gas pipeline also influenced the peak combined vibration velocity and effective stress, with silty clay having the greatest impact, followed by clayey silt, and then miscellaneous soil.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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